Yikes,  I see from Lorn's reply and the Hartzell web site that 68" and 72" props are used on 360's.  The 72" prop was just too long.  Hmmmm, 70" seems an odd ball for the 360.

 

Grayhawk

 

The hub is close to what you identify...HC-F2YR-1
The blade design is....F7666A-6  (is that [76" less 6" = 70"])

Someone mentioned that the 320 could use a 70" prop, but it sounds like a
different blade than what you identify.

I'm really confused now???
Thanks,
Matt McManus

Quoting Sky2high@aol.com:

> Matt,
>
> Interesting.  Can you give us the hub and blade designation - perhaps  it is
> the setup that 320's use. That is: hub HC-F2YL-1F with blades F8468D-14  (84"
> less 14" = 70").  I have gone thru, uh, several blades and it was some  years
> ago that the 320 set-up went from "normal" to "experimental".  Oh  well.
>
>
> Scott Krueger  AKA Grayhawk
> Lancair N92EX IO320 SB 89/96
> Aurora, IL (KARR)
>
> Pilot  not TSO'd, Certificated score only > 70%.
>
>
>
>
> In a message dated 11/15/2008 6:36:51 A.M. Central Standard Time,
> mmcmanus@grandecom.net writes:
>
> I'm in  the middle of getting my Hartzell 2 blade prop overhauled for my
> Lancair
> 360.  I got a new hub at 50% discount from Hartzell to  eliminate the
> recurring
> eddy current inspection. The prop shop doing the  overhaul has issues with
> the
> blades and they will not issue the formal 8131  (I think) paperwork for the
> overhaul.  The problem is the blade  length.
>
> I bought the airplane 3 years ago and it had an overhauled "0"  time prop
> when
> the airplane was built in 2002. The blades are 70" long  according to the
> prop
> shop.  They also say that the Hartzell  recommends a 72" blade. But Hartzell
> also allows a 68" blade for the Lyc  360.  They do not however, recommend a
> 70"
> blade.
>
> The question  is, since I've had no problems or vibration issues with my 70"
> blades -  should I be concerned? I guess Hartzell's recommendation is based
> on
> some  harmonic resonance or some other vibration related things (which  are
> outside my knowledge).  Does my 70" blade length provide cruise or  climb
> capabilities that are greater or lesser than a 68" prop.
>
> I'm  planning to have the 70" blades reinstalled on the new hub, and the  log
> entry will just say the standard overhaul stuff (except the IAW stuff),  and
> it
> will specify "experimental A/C usage only."
>
> Any  thoughts?
>
> Thanks,
> Matt McManus
> lnc2 360
> 408 hours total time  airplane.
>
>
>
>
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